The phrase "army struggled" is correct and usable in written English.
It can be used to describe a situation where a military force faced difficulties or challenges in a particular context.
Example: "The army struggled to maintain control over the territory amidst rising insurgent activity."
Alternatives: "military faced challenges" or "armed forces encountered difficulties".
Rescue workers, aided by the Indian Army, struggled to pull survivors from the wreckage.
As a consequence, even before Mr Hung's death, the army struggled to get enough recruits.
All four men were exceptionally bright and hard-working, rising through the ranks as the Army struggled to rebuild itself.
The Pakistani Army struggled to defeat the Pakistani Taliban in battles in the Swat Valley and South Waziristan in 2009 and 2010, but the Taliban are still present in both places, a senior American military official said.
Hundreds of civilians were reported killed in shelling, as the army struggled to root out Tamil Tiger rebels from the last few square kilometres of land under their control.
CAIRO — Egypt's powerful Muslim Brotherhood and the secular opposition banded together Sunday around a prominent government critic to negotiate for forces seeking the fall of President Hosni Mubarak, as the army struggled to hold a capital seized by fears of chaos and buoyed by euphoria that three decades of Mr. Mubarak's rule may be coming to an end.
Tunisia's small cash-strapped army struggles to police the mountainous infiltration routes used by militant organisations.
Meanwhile the army struggles to run its wars with too few people, especially infantrymen, and too little helicopter lift.
Despite its proximity to Eurasia, Africa was spared until 1887, when the Italian Army, struggling to conquer Abyssinia, imported Indian cattle for food and draft power.
But the army, struggling to shake off the stigma of the Tiananmen Square massacre, projected a softer image, with many troops wearing ties and white gloves rather than combat gear.
Set during the English civil war, "As Meat Loves Salt" is regarded by those who know it as one of the great novels of the past decade a story of two men in Cromwell's army, struggling for dominance over one another just as the royalist and parliamentary forces struggled for England.
