Category:21st-century warfare
Warfare by century: (BCE) 29th century · 28th century · 27th century · 26th century · 25th century · 24th century · 23rd century · 22nd century · 21st century · 20th century · 19th century · 18th century · 17th century · 16th century · 15th century · 14th century · 13th century · 12th century · 11th century · 10th century · 9th century · 8th century · 7th century · 6th century · 5th century · 4th century · 3rd century · 2nd century · 1st century · (CE) 1st century · 2nd century · 3rd century · 4th century · 5th century · 6th century · 7th century · 8th century · 9th century · 10th century · 11th century · 12th century · 13th century · 14th century · 15th century · 16th century · 17th century · 18th century · 19th century · 20th century · 21st century ·