troop across (something or some place)
To move or march from one side of something or some place to another as a group or in large numbers. The students trooped across the field on their way to the trailhead. We watched the herd of elephants troop across the savanna
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
troop across someone or something
[for a mass of creatures] to move across someone or something. The huge herds of wildebeest began to troop across the plain in search of food. The ants trooped across Karen as she lay in the sand.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.