Answer based on context:

Mark Brunell and the Redskins marched into Giants Stadium with a victory in mind. It ended up being misery within three hours, as they lost to a team who, at the time, had a poorly rated defense. Clinton Portis rushed for 76 yards. Santana Moss caught 3 receptions for only 39 yards, while Chris Cooley beat out Santana Moss with 4 receptions for 41 yards. Total offense for the Redskins was 164 yards, while the New York Giants put up 411 yards. The Redskins defense ended up with no sacks, interceptions, or turnovers. John Hall was 1/2 on field goals with no PATs. With another loss, the Redskins dropped to 2-3. Stats

How many field goals did John Hall miss?
1