Leyton Orient secured a vital 2-1 home victory over promotion-chasing Peterborough United in a tense League One encounter. A late winner from substitute striker Theo Archibald proved decisive, moving Orient further clear of the relegation scrap and denting Posh's automatic promotion ambitions. The match began with high intensity, and Peterborough took an early lead through a clinical finish from their top scorer. Orient responded well, equalizing before halftime through a powerful header from a corner. The second half was a cagey affair, with both sides creating chances, but it was Orient who found the breakthrough in the 82nd minute when Archibald pounced on a defensive error to slot home. The result sees Orient climb to a more comfortable mid-table position, while Peterborough will rue a missed opportunity to close the gap on the top two.