The Devi MAhatmyam or Sri Chandi has three sections - 1. Madhukaitava Vadha or the slaying of the demons Madhu and Kaitva. 2. MahishAsura Vadha and 3. Shumbha Nishumbha Vadha.
In the the first section, there are no battles involving army. So, in this section nothing relevant found.
In section 2 there are some mentions. Here the commander in chief of MahishAsura as well as few other powerful Asuras went to fight Devi. There they are mentioned as accompanied by very large troops.
The relevant verses from the Madhyama Charitah are as follows:
MahishAsurosenAnishchikshurAkhyA mahAsurah |
chAmarashchAnyaishchaturangavalAmbitah || 41
RathAnAmayutyaih shadbhirudagrAkhyo mahAsurah |
AyudhyatAyutanAncha sahasrena mahAhanuh || 42
At that time, the powerful Asura called Chikshura, who was the
commander-in-chief of MahishAsura, and another Asura called ChAmara,
went to the battle scene surrounded with elephants, horses, chariots
and infantry troops. 41
The Udagra Asura started the battle being surrounded by 6 thousands
chariots. And the Asura called MahAhanu battled being surrounded by
crores of chariots on his side. 42
PanchAshadbhishcha niyutairasilomA mahAsurah |
shadbhirvAskAlo yuyudhe rane || 43
Vrito rathAnAm kotyA cha yuddhe tasminnayudhyate || 44
And, then the MahAsura called Asiloma started to fight with 5 crores
of chariots on his side, and the VAskala Asura had 6 lakhs of chariots
fighting for him. 43
The Asura called ParivArita also started to fight along with thousands
and thousands of elephants, horses and crores of chariots. 44
In the last section there are no such mentions, at least no mention of such large troops. Devi creating from her breath a troop of 500 fighters and similar others are only mentioned.