Through the 2008 season, that was December 12, 1999 when the Cowboys defeated the Eagles, 20-10, in Dallas.
The Eagles have won 6 straight December games against the Cowboys since then.
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The Dallas Cowboys beat the Philadelphia Eagles in Dallas two weeks in a row at the end of the 2009 season.
On Jan. 3, 2010, the final game of the regular season, the Cowboys defeated the Eagles 24-0 at Cowboys Stadium. Six days later, the Cowboys eliminated the Eagles from the wild card round of the playoffs with a 34-14 win at Cowboys Stadium.