On September 15, 1944, General William Rupertus and the 16,000 Marines of the U.S. 1st Marine Division moved confidently toward Peleliu, an obscure speck of coral island 500 miles east of the Philippines. Though he knew a tough fight awaited him, Rupertus anticipated a quick two-day crush to victory, strengthening Gen. Douglas MacArthur's flank in his drive on the Philippines. Instead, as The Devil's Anvil reveals, American forces struggled...