"collection of troops" is correct and usable in written English.
You can use it when referring to a group of troops (particularly military personnel) who have been gathered together for a specific purpose. For example, "The general ordered for the collection of troops to be stationed at the eastern border of the country."
It wouldn't, of course, be a collection of "Star Wars" troops fighting battles in outer space.
This New York Times best-seller is an exhaustive collection of correspondence between troops and their families from every war since the Revolution.
Along with interviews with medics and military doctors, and a month spent by two journalists from The Times observing the collection and immediate treatment of troops suffering from a wide range of trauma, the data shows the results, in broad terms, of an evolving contest for wounded soldiers' fates.
Every day, a collection of newspaper types troop in: Arnold Brad Bellamyy), the grunting curmudgeon, Nora, Margaret Dalyy) the busybody features editor, John William Connelll), the glib editorial writer, and jokey Wally (Paul Molnar).
Rumsfeld has moved hundreds of millions of dollars and thousands of troops into clandestine intelligence collection and analysis.
A trench system may begin simply as a collection of foxholes hastily dug by troops using their entrenching tools.
The latter began as a long-range passenger airliner and was later used by the Luftwaffe for troop transport, collection of intelligence, and bombing missions.
This recent and very graphic—Instagram video shows the Rayat al Tawheed crew playing around with a collection of severed heads, purportedly from government troops.
This recent – and very graphic – Instagram video shows the Rayat al Tawheed crew playing about with a collection of severed heads, purportedly from government troops.
The collection includes 36,000 pages of institutional documents of German Great General Staff, staffs and chiefs of troops, military units, the Prussian War Ministry, Ministry of Internal Affairs, Ministry of Foreign Affairs and others.
