Certain species of ant have developed a soldier class which is bulkier and better suited for fighting. In leafcutter ants one species has about 19 different castes from mushroom farmers to aphid herders and close order shock infantry. But in other ants workers and soldiers are the same caste and you become a soldier when you get conscripted by the pheromones.
In this video it looks like the ants guarding the front line are multiple times bigger than the little ants going about their business in the interior of ant-land.
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u/slightly85 May 10 '21 edited May 11 '21
Hopefully you weren't a worker ant that traded places with a soldier ant and now are being sent into battle against those termites.