Cotter was a stocky, round-arm, genuinely fast bowler from Sydney who had been Australia's strike weapon from 1903 to 1912. After the Big Six dispute he never played another Test. When war broke out he enlisted in the Australian Imperial Force, joining the 12th Light Horse Regiment. Posted to Palestine, he was a trooper at the Battle of Beersheba on 31 October 1917 — the famous mounted charge by the 4th and 12th Light Horse Regiments that took the Turkish defences. Accounts differ on exactly when Cotter fell. Most reliable narratives say he was shot near the wells of Beersheba in the late afternoon, after the charge had succeeded, while clearing Turkish positions. He was buried in the Beersheba War Cemetery. The news reached Australia weeks later and was reported in every major paper. Cotter joined Trumper, who had died of natural causes in 1915, in the lengthening list of Big Six players who would never play Test cricket again.