What is "fallen in"

Usage examples of "fallen in".

He kept starting wars and mothers kept weeping because their sons had fallen in battle.

He would be, at the last, the redemptionfor the souls of the fallen in this city.

Part of the high, arched ceiling had fallen in, creating random rubble on the floor, but enough of the gadgets and programs were still working to maintain something of an atmosphere-though it wasn't quite the one the designers had intended.

Part of the high, arched ceiling had fallen in, creating random rubble on the floor, but enough of the gadgets and programs were still working to maintain something of an atmosphere—.

There might have been a time when Pham Nuwen would have fallen in love with that art, but now he knew how it had been made.