ISIS holds little more than the length of a few football fields in Iraq's second-largest city

ISIS holds nothing more than the length of a few football fields in Iraq's second-largest city, according to New Zealand Army Brigadier Hugh McAslan, the deputy commanding general for land forces in Operation Inherent Resolve.

"In the last couple of weeks in particular, [Iraqi security forces] have made great progress in what has been a very difficult fight, in very difficult terrain," McAslan told Business Insider from Baghdad in a Skype interview.

"Certainly as we come into these last few neighborhoods, it's very clear to us ISIS is a desperate and degraded enemy."

22 PHOTOS
Iraqi Counter-Terrorism Service works to recapture Mosul from ISIS
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Iraqi Counter-Terrorism Service works to recapture Mosul from ISIS
Members of Iraq's Counter-Terrorism Service (CTS) advance in the Old City of Mosul on July 5, 2017, during the government forces' ongoing offensive to retake the city from Islamic State (IS) group fighters. Iraqi forces have been closing in on the Old City in west Mosul for months, but the terrain combined with a large civilian population has made for an extremely difficult fight. / AFP PHOTO / Fadel SENNA (Photo credit should read FADEL SENNA/AFP/Getty Images)
Members of the Iraqi Counter-Terrorism Service (CTS) advance through Mosul's Old City on July 6, 2017, during the offensive to retake the city from Islamic State (IS) group fighters. Iraqi forces battled the last remaining jihadists in Mosul's Old City, where the UN said up to 20,000 civilians are trapped and in 'extreme danger'. / AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
A member of the Iraqi Counter-Terrorism Service (CTS) raises the victory gesture as others hold upside-down the black flag of the Islamic State (IS) group, outside the destroyed Al-Nuri Mosque in the Old City of Mosul, after the area was retaken from IS, on June 30, 2017. Explosions on June 21 evening levelled the mosque, where Abu Bakr al-Baghdadi gave his first sermon as leader of the Islamic State group and its ancient minaret. Iraq will declare victory in the eight-month battle to retake second city Mosul from jihadists in the 'next few days,' a senior commander said on June 30, 2017. Iraqi forces launched the gruelling battle for Mosul on October 17, 2016, advancing to the city and retaking its eastern side before setting their sights on the smaller but more densely populated west. / AFP PHOTO / FADEL SENNA (Photo credit should read FADEL SENNA/AFP/Getty Images)
TOPSHOT - A member of Iraq's Counter-Terrorism Service (CTS) advances in the Old City of Mosul on July 5, 2017, during the government forces' ongoing offensive to retake the city from Islamic State (IS) group fighters. Iraqi forces have been closing in on the Old City in west Mosul for months, but the terrain combined with a large civilian population has made for an extremely difficult fight. / AFP PHOTO / Fadel SENNA (Photo credit should read FADEL SENNA/AFP/Getty Images)
Civilians flee as members of Iraq's Counter-Terrorism Service (CTS) advance in the Old City of Mosul on July 5, 2017, during the government forces' ongoing offensive to retake the city from Islamic State (IS) group fighters. Iraqi forces have been closing in on the Old City in west Mosul for months, but the terrain combined with a large civilian population has made for an extremely difficult fight. / AFP PHOTO / Fadel SENNA (Photo credit should read FADEL SENNA/AFP/Getty Images)
A member of Iraq's Counter-Terrorism Service (CTS) advances in the Old City of Mosul on July 5, 2017, during the government forces' ongoing offensive to retake the city from Islamic State (IS) group fighters. Iraqi forces have been closing in on the Old City in west Mosul for months, but the terrain combined with a large civilian population has made for an extremely difficult fight. / AFP PHOTO / Fadel SENNA (Photo credit should read FADEL SENNA/AFP/Getty Images)
A member of the Iraqi Counter-Terrorism Service (CTS) stands outside a doorway while advancing in the Old City of Mosul on July 5, 2017, during the government forces' ongoing offensive to retake the city from Islamic State (IS) group fighters. Iraqi forces have been closing in on the Old City in west Mosul for months, but the terrain combined with a large civilian population has made for an extremely difficult fight. / AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
A member of Iraq's Counter-Terrorism Service (CTS) climbs through a hole in a wall while advancing in the Old City of Mosul on July 5, 2017, during the government forces' ongoing offensive to retake the city from Islamic State (IS) group fighters. Iraqi forces have been closing in on the Old City in west Mosul for months, but the terrain combined with a large civilian population has made for an extremely difficult fight. / AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
A member of Iraq's Counter-Terrorism Service (CTS) holds a position in the Old City of Mosul on July 5, 2017, during the government forces' ongoing offensive to retake the city from Islamic State (IS) group fighters. Iraqi forces have been closing in on the Old City in west Mosul for months, but the terrain combined with a large civilian population has made for an extremely difficult fight. / AFP PHOTO / Fadel SENNA (Photo credit should read FADEL SENNA/AFP/Getty Images)
Civilians flee as members of Iraq's Counter-Terrorism Service (CTS) advance in the Old City of Mosul on July 5, 2017, during the government forces' ongoing offensive to retake the city from Islamic State (IS) group fighters. Iraqi forces have been closing in on the Old City in west Mosul for months, but the terrain combined with a large civilian population has made for an extremely difficult fight. / AFP PHOTO / Fadel SENNA (Photo credit should read FADEL SENNA/AFP/Getty Images)
A member Iraqi Counter-Terrorism Service (CTS) rests inside a house in the Maidan district in Mosul's Old City on July 4, 2017, during the ongoing offensive to retake the city from Islamic State (IS) group fighters. / AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
TOPSHOT - Iraqi Counter-Terrorism Service (CTS) advance inside a house in the Maidan district in Mosul's Old City on July 4, 2017, during the ongoing offensive to retake the city from Islamic State (IS) group fighters. / AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
TOPSHOT - Iraqi Counter-Terrorism Service (CTS) stand guard next to Mosul's destroyed ancient leaning minaret, known as the 'Hadba' (Hunchback), in the Old City of Mosul on July 4, 2017, during the ongoing offensive to retake the city from Islamic State (IS) group fighters. / AFP PHOTO / Fadel SENNA (Photo credit should read FADEL SENNA/AFP/Getty Images)
A member of the Iraqi Counter-Terrorism Service (CTS) uses a cell-phone while sitting outside the door of a humvee in the vicinity of the destroyed Al-Nuri mosque in the Old City of Mosul on July 2, 2017, during the offensive to retake the city from Islamic State (IS) group fighters. / AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
Iraqi Counter-Terrorism Service (CTS) advance inside a house in the Maidan district in Mosul's Old City on July 4, 2017, during the ongoing offensive to retake the city from Islamic State (IS) group fighters. / AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
TOPSHOT - An Iraqi flag waves as it hangs outside a Counter-Terrorism Service (CTS) humvee driving past the destroyed Al-Nuri Mosque in the Old City of Mosul on July 2, 2017 during the Iraqi government forces' offensive to retake the city from Islamic State (IS) group fighters. Explosions on the evening of June 21, 2017 levelled the mosque where Abu Bakr al-Baghdadi gave his first sermon as leader of the Islamic State group, along with its ancient minaret. / AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
A member of Iraq's Counter-Terrorism Service (CTS) poses for a picture in a skeleton-defaced ski-mask, as Iraqi forces advance towards the Old City of Mosul on June 20, 2017 during the ongoing offensive by Iraqi forces to retake the last district still held by the Islamic State (IS) group. / AFP PHOTO / Ahmad al-Rubaye (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
A member of Iraq's elite Counter-Terrorism Service smokes a waterpipe (narjileh or shisha) while on a break, during the advance towards the Old City of Mosul on June 19, 2017 as the ongoing offensive continues to retake the last district still held by the Islamic State (IS) group fighters. Iraqi forces pushed deeper into Mosul's Old City after launching a final assault on the Islamic State group, warning civilians to stay inside and telling jihadists to 'surrender or die'. / AFP PHOTO / MOHAMED EL-SHAHED (Photo credit should read MOHAMED EL-SHAHED/AFP/Getty Images)
An Iraqi Counter-Terrorism Service (CTS) sniper takes a shot during the advance towards the Grand Mosque of Nuri in the Old City of Mosul on June 29, 2017, as the offensive by Iraqi forces continues to retake the last district still held by the Islamic State (IS) group. / AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
Members of the Iraqi Counter-Terrorism Service (CTS) rest and regroup while advancing towards the Grand Mosque of Nuri in the Old City of Mosul on June 29, 2017, during the ongoing offensive by Iraqi forces to retake the last district still held by the Islamic State (IS) group. / AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
A member of Iraq's elite Counter-Terrorism Service waves as another holds a cell while on a break, during the advance towards the Old City of Mosul on June 19, 2017 as the ongoing offensive continues to retake the last district still held by the Islamic State (IS) group fighters. Iraqi forces pushed deeper into Mosul's Old City after launching a final assault on the Islamic State group, warning civilians to stay inside and telling jihadists to 'surrender or die'. / AFP PHOTO / MOHAMED EL-SHAHED (Photo credit should read MOHAMED EL-SHAHED/AFP/Getty Images)
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According to McAslan, only about 15 acres, or approximately 3% of Mosul, remains in the hands of ISIS forces as the Iraqi military moves further into the western part of the city. Although ISIS still has small pockets of terrain in Iraqi cities such as Hawija, Tal Afar, and Al Qaim, McAslan is confident that once the city is recaptured, other cities will continue to fall.

What the Iraqis have done in Mosul is "hugely significant against a very brutal and cruel enemy," McAslan said.

Despite the coalition's success, that last 3% will not come easy despite only a "couple of hundred" ISIS fighters remaining to put up a fight. Some reports suggest that ISIS has been forcing civilians to stay in their homes and risk death as the battle rages around them, instead of allowing them to escape.

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ISIS jails hidden in plain sight in Mosul
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ISIS jails hidden in plain sight in Mosul
Members of the Iraqi Army's 9th Armoured Division stand outside a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
A member of the Iraqi Army's 9th Armoured Division stands inside a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
A coffee mug is seen on a table at a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
A steel gate leads to a section of a compound used as prison for men inside a building abandoned by Islamic State militants in July 17 district, in western Mosul, Iraq June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
A member of the Iraqi Army's 9th Armoured Division searches through a desk inside a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
Clothing left behind by Islamic State militants is seen on the floor in a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
Rotten food is seen on a kitchen table inside a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
The photo of an unidentified girl is seen on a desk inside a compound used as prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
Mattresses of prisoners are seen inside a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
Documents and envelopes are scattered inside an office, at a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
Damaged surveillance monitors are seen in the control room in a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
Materials for making self-made bombs are seen on the floor inside a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
The shadow of a member of the Iraqi Army's 9th Armoured Division is seen in a room used as a cell for men, inside a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
A member of the Iraqi Army's 9th Armoured Division holds a self-made bomb found inside a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
Members of the Iraqi Army's 9th Armoured Division inspect the cables of the surveillance system inside a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
A member of the Iraqi Army's 9th Armoured Division inspects a room used as a cell for women inside a compound used as a prison by Islamic State militants in the July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.
The shadow of a member of the Iraqi Army's 9th Armoured Division is seen as he opens a steel gate to a room used as a cell for men, inside a compound used as a prison by Islamic State militants in July 17 district, in western Mosul, Iraq, June 6, 2017. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS PRISON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY.
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The terror group has also, according to McAslan, herded civilians into buildings, used human shields, and forced children to fight.

"There's still work to do though, and we'll continue to remain steadfast with our Iraqi partners until ISIS is defeated throughout Iraq," McAslan said.

Outside of Mosul, the coalition-backed Syrian Democratic Forces have continued to push further into Raqqa, Syria, the self-proclaimed capital of the Islamic State. The coalition estimates there are approximately 3,000 to 4,000 fighters left to defend that city.

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