Liam Lindsay's late header earned Airdrie a 1-0 win at Peterhead in an end-of-season dead rubber.The visitors were the better side from the start and Ross Docherty brought a parry save from Graeme Smith midway through the first half before testing him again shortly afterwards.The pressure continued as Bob McHugh hit the post with a fierce drive seven minutes before the break.McHugh then skied a chance from six yards while Smith was forced into another save as it looked as if Airdrie would have to settle for a point.But Lindsay earned a deserved win when he converted Scott Fraser's cross with seven minutes remaining.