Hawthorne Daniel, Ships of the seven seas (1925)
“ Down to the 14th Century the ships of northern Europe showed strongly the Scandinavian influence. The Vikings had developed ships similar in shape to the whaleboats of to-day. They were double-ended affairs, long, low, narrow, and fast, propelled largely by oars, but carrying, generally, one large square sail set about amidships on a sturdy mast. A VIKING SHIPThese ships were developed by the Norse sea rovers for use in war, and as the seas they sailed were generally rough their ships had to be seaworthy. ”
