Which was the last war in which swords were used?

Question

Which was the last war in which swords were actively used as the primary weapon by an army?

Answer 1

Swords were still relevant weapons up into WWII, however, they stopped being important and primary weapons in the mid-to-late 1800s, and once WWI came along (often deemed the first modern war), they were mostly obsolete aside from certain preferences. There is no definitive answer on which war was for certain the last war with primary sword usage.