The Advance-Guard, or The Military Sacrifice (The Ambush) is an 1890 oil painting by Frederic Remington.

[1][2] The painting depicts a cavalry scout slumping over his horse after being shot by an unseen Sioux warrior in ambush.

Behind the scout are other mounted troops who are fleeing the ambush.

[3] In an auction of 1893 led by Thomas Ellis Kirby at the American Art Association, the painting was sold to E. H. Wales for US$250.

[4][5] It was acquired by the George F. Harding Museum some time before 1982.