The phrase "mass troops" is correct and usable in written English.
You can use it to refer to a large group of soldiers. For example, "The general ordered his mass troops to mount up and prepare for battle."
This week Turkey continued to mass troops along the border.Is Turkey preparing to attack?
The United States and the United Kingdom, however, were convinced that Iraq never intended full cooperation and began to mass troops and war matériel around Iraq in preparation for a military conflict.
The latter was itself a delicately worded compromise, because several Arab states have already allowed the United States and Britain to mass troops and weaponry within striking distance of Iraq.
And Iraq's ruling Shia parties are loth to give Sunni rebels a safe haven for al-Qaeda radicals to wire up suicide-bombs or mass troops for assaults, especially as they may be directed as much against Shia "apostates" as against Americans or Iraq's fledgling army.
Information on the battlefield will become so rich, so accurate, so immediate, so easily available to all levels, that it will be suicidal to mass troops on the ground.
Consequently, in May and early June, when the French started to mass troops by Mainz and it looked as if the bulk of the French army would cross there they even engaged the imperial force at Altenkirchen (4 June) and Wetzler and Uckerath (15 June)—Charles felt few qualms placing the 7000-man Swabian militia at the crossing by Kehl.
Without declaration and invasion, without the sort of grand event of war with attendant presidential addresses and mass troop deployments, it's hard to imagine drumming up the sort of mass event-based response that constituted the movement against the Iraq war.
But both countries are massing troops near the border.
Syria, Jordan, Iraq, Saudi Arabia, Morocco, Tunisia and Libya were all united, encircling Israel and massing troops.
Now nuclear rivals, they have been massing troops at their border.
A Ukrainian military spokesman also said Russia was again massing troops at the border.
