Twenty idle WWI-style armored troop carriers that Carl suspects are decoys, unmoved since being uncovered.
Tran pats a spot on the map where twenty tanks sit idle behind the enemy line. Carl observes they have not moved since they were uncovered and wonders aloud whether they are decoys; Elle offered to take a closer look, but he told her to stay back.
If they are real, the tanks count as armor, and they are all WWI-style troop carriers with various turrets. Carl suspects they would then be the same as the crawlers' own Spider Tanks — temporary pieces of crap that serve a purpose until they are either disassembled or blown to hell.
Twenty WWI-style tracked troop carriers fitted with assorted turrets, sitting motionless behind the enemy trenches.
Possible decoy armor, or a disposable enemy mechanized reserve.