[DRG]

https://www.history.com/topics/world...0light%20tanks.

Measuring around two miles long and a half-mile wide, the island of Betio was crisscrossed with defenses: 100 pillboxes (dug-in concrete bunkers), seawalls, an extensive trench system for defensive movements and an airstrip were supported by coastal guns, antiaircraft guns, heavy and light machine guns and light tanks. Betio’s beaches were naturally ringed with shallow reefs, which were covered with barbed wire and mines.

So barbed wire and mines it will be in the areas with the borked mines



https://www.lonesentry.com/articles/...and/index.html