• Cold War military history by country (25 C)
• Involvement in the Russian Civil War by country (9 C)
• World War I by country (53 C, 30 P)
• World War II military history by country (60 C, 21 P)

C

• 20th-century military history of China (13 C, 6 P)
• 20th-century military history of Croatia (3 C, 2 P)

F

• 20th-century military history of France (11 C, 29 P)

G

• 20th-century military history of Greece (8 C, 2 P)

J

• 20th-century military history of Japan (4 C, 13 P)

P

• 20th-century military history of Poland (5 C, 21 P)

R

• 20th-century military history of Russia (11 C, 8 P)

S

• Military history of the Soviet Union (15 C, 42 P)
• 20th-century military history of Spain (2 C, 8 P)

T

• 20th-century military history of Thailand (8 P)

U

• 20th-century military history of Ukraine (5 C, 4 P)
• 20th-century military history of the United Kingdom (25 C, 89 P)
• 20th-century military history of the United States (22 C, 148 P)