I suspect it's meant to portray George Washington at Valley Forge (where he spent a winter with his army during the War of Independence). From Wikipedia:
"Valley Forge long occupied a prominent place in American storytelling and memory. The image of Valley Forge as a site of terrible suffering and unshakeable perseverance emerged years after the encampment ended." (https://en.wikipedia.org/wiki/Valley_Forge)
"Valley Forge long occupied a prominent place in American storytelling and memory. The image of Valley Forge as a site of terrible suffering and unshakeable perseverance emerged years after the encampment ended." (https://en.wikipedia.org/wiki/Valley_Forge)