CORSHAM had to overturn a two-goal defecit to extend their long unbeaten Premier Division run.
Nobby Bush's charges trailed at home to Exmouth but Ryan Bush gave Corsham hope with 12 minutes left and Alan Griffin levelled at the death.
Devizes suffered an embarrassing 6-2 defeat at home to bottom club Clyst.
Calne closed on the leaders in the First Division thanks to a 3-0 win over 10-man Chard. After a goalless first half, Ben Moore opened the scoring with a 25-yard screamer.
Glenn Armstrong hooked in the second and thumped in a third after James Lye sent him clear.
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