Hugh M. Cole, The Ardennes: Battle of the Bulge… (1965)
“ Rotation in the line allowed others a few hours in Luxembourg City, ice cream in several flavors, well-watered beer, and the dubious pleasure of hearing accordionists squeeze out German waltzes and Yankee marching songs of World War I vintage. Replacements, now by order named "reinforcements," joined the division, but by mid-December the regiments still averaged five to six hundred men understrength. Infantry replacements were particularly hard to obtain and many rifle companies remained at no better than half strength. ”
