Washington led, 3-0, after one quarter, before an outburst of offense in the second quarter. New York opened the second quarter with a 1-yard touchdown by Andre Brown.
The Redskins retook the lead on a 26-yard touchdown pass from Robert Griffin III to Santana Moss with 8:45 left in the quarter. Griffin III threw a short screen pass to Moss who cut upfield and went into the end zone untouched.
Moss celebrated by getting up close and personal with FOX's camera.
Lawrence Tynes tied the game at 10 with a 27-yard field goal with 3:53 left in the half. The Giants had to settle for the field goal after Manning threw behind Victor Cruz on a third-down pass that would have been a touchdown.
Forbath snuck a 43-yard field goal inside the left goalpost with 1:49 left in the half to put the Redskins back ahead.
The Giants drove down in the final two minutes of the half, allowing Tynes to kick a 39-yard field goal in the final seconds of the half to tie the score at 13 going into halftime.
In the first NFC East game of his career, Griffin III is 5-for-8 passing for 85 yards as well as three carries for 42 yards. Alfred Morris leads the Washington rushing game with 94 yards on 13 carries in the first half.
Manning was 17-for-26 passing for 186 yards.
The game is a showdown of two of the teams in the NFC East, with the 4-2 Giants sitting atop the division and the Redskins tied for second with the Philadelphia Eagles at 3-3.
The Redskins will receive the ball to begin the second half.