carlisle slumped to a 3-1 defeat away at accrington stanley .
the team 's poor performance prompted a scathing assessment from manager keith curle who suggested some of his squad were not fit for purpose .
carlisle are without a win in five games in league two and just two places above the relegation zone .
the cumbrians were relegated from league one last season and are at a serious risk of dropping out of the football league entirely this term .