Chris McMillan lashed in a last-gasp winner as Arncott fought back from a goal down to win 2-1 at Steeple Aston in the Premier Division.
The hosts took the lead when Viv Greywoode headed in.
Arncott levelled through Dan Smith from the penalty spot midway through the second half after McMillan was brought down by the keeper.
McMillan’s struck a minute from time to seal victory.
In Division 1, Bishops Itchington Res won 2-1 at home to Heyford Athletic, with a double from Seb Cox.
He fired in from 20-yards, before completing his brace from the penalty spot.
Matt Spittle pulled one back, but it was too late for Heyford.
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