en_tn_condensed/jos/10/42.md

Joshua captured all these kings and their land

This refers to the kings and lands that were listed beginning in Joshua 10:28.

Joshua captured

Here Joshua represents his whole army. AT: "Joshua and his soldiers captured" (See: rc://en/ta/man/translate/figs-synecdoche)

at one time

This does not mean in one day. It means during one military campaign, which may have lasted many days or weeks.