This is the 8362nd most frequent Polish word.
piechota
Infantry.
Here, "piechota" refers to a branch of armed forces, specifically the infantry.
Piechota idzie przez miasto.
The infantry is marching through the city.
In this sentence, "piechota" is used to signify traveling by foot rather than by any vehicle.
Szliśmy piechotą na wycieczkę w góry.
We walked on foot for a trip to the mountains.
"Piechota" indicates the military unit or force composed of soldiers fighting on foot.