Konstantinos Paleologos Emperor Of The Greco-Romans In The Battle Of The 29th May 1453 - Theofilos (Hadjimichail)
Battle of Nivelle - (after) Heath, William
Battle of Rocroi the Duke of Enghien reviewing his troops on the eve of the battle - Alphonse Lalauze
Troops Bivouacked near Villa Velha, engraved by C. Turner, 19th May 1811 - Thomas Staunton St. Clair
Drum Major and Co of a Regiment, of the Line with Pioneer of the Grenadier Company of D, from Costumes of the Army of the British Empire, according to the last regulations 1812, engraved by J.C. Stadler, published by Colnaghi and Co. 1812-15 - Charles Hamilton Smith
Combat on board the ship Tonnant, engraved by Jean Baptiste Morret fl.1790-1820 1789 2 - (after) Swebach, Jacques Francois Joseph
Battle of Gettysburg, 1863, printed by L. Prang and Co., 1887 - Thure de Thulstrup
Battle between Heraclius and Chosroes - Piero della Francesca
Military Encampment 3 - Robert van den Hoecke
The Rent War in Ireland Burning the Houses of Evicted Tenants at Glenbeigh County Derry - Amedee Forestier
Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the 
