Who created "The Advance-Guard, or The Military Sacrifice (The Ambush)"?

The Advance-Guard, or The Military Sacrifice (The Ambush) was created by Frederic Remington in 1890.

What medium is "The Advance-Guard, or The Military Sacrifice (The Ambush)"?

The Advance-Guard, or The Military Sacrifice (The Ambush) is Oil on canvas.

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Frederic Remington, 1890