The phrase "attacking armies" is correct and usable in written English.
It can be used in contexts discussing military actions, warfare, or historical events involving military forces engaged in combat.
Example: "The history books are filled with accounts of attacking armies that changed the course of nations."
Alternatives: "assaulting forces" or "invading troops".
He commanded the defense of the southern port of Basra against the Iranians, whose attacking armies came within a few miles of the city.
At a cost of tens of millions of dollars annually it maintains a system of about 26,000 bunkers and fortifications throughout the Swiss Alps meant to deter attacking armies.
Viewing fortresses as nothing more than immense permanent batteries designed to pour overwhelming fire on attacking armies, Montalembert simplified the intricate geometric designs of Vauban and relied on simple polygonal structures, often with detached peripheral forts instead of projecting bastions.
Hundreds of thousands of residents in the besieged Syrian city of Aleppo are shunning so-called "humanitarian corridors" set up by Russian and Syrian forces, choosing to risk starvation and an escalating campaign of airstrikes rather than leave their homes and trust their lives to the attacking armies.
These two emblems are introduced in the opening scenes and run through the movie until the final battle, when the attacking armies are represented as a sea of crosses.
If you successfully wipe out all of the defending armies in the area you are attacking, occupy the territory with at least as many attacking armies as used in the attack.
The front in turn has its own military force, the Islamic Salvation Army, which concentrates on attacking army patrols and installations.
Abruptly, he said, he remembered a story from history, about Jews blowing horns to scare away an attacking army.
Six brigades of the international army, composed chiefly of Frenchmen, Belgians, Englishmen, Americans, Poles, Czechs and Russians, form the spear-head of General Miaja's attacking army.
Price's points were sound; military doctrine of the day called for an attacking army to outnumber an entrenched defending force by at least three to one.
Before Edward's regiment, the 17th Kentucky, left camp at Calhoun where they enrolled, an outbreak of measles "raged through the camp like some attacking army".
