Query: Who invaded northern England?
Context: In King's Lynn, John contracted dysentery, which would ultimately prove fatal. Meanwhile, Alexander II invaded northern England again, taking Carlisle in August and then marching south to give homage to Prince Louis for his English possessions; John narrowly missed intercepting Alexander along the way. Tensions between Louis and the English barons began to increase, prompting a wave of desertions, including William Marshal's son William and William Longespée, who both returned to John's faction.