The Proto-Indo-European word *k̂at-
Word *k̂at-
Meaning battle

Comments
OCS kotora, Gaul. catu, Eng. heaþu, Gm. hathu/, Skr. śātayati, ON hoð, Ir. cath/cath, Welsh cad, Toch. /keta

Other words that might be of interest
*ghostis ‘enemy, stranger, guest’, *koro- ‘war’, *des- ‘enemy’, *skolmehₐ ‘sword’