49ers lead Cowboys at half behind stifling defense, George Kittle’s pair of touchdowns

The San Francisco 49ers have a double-digit lead over the Dallas Cowboys after the first half, up 21-7 on “Sunday Night Football.” Here’s what you need to know:

49ers tight end George Kittle scored two first-half touchdowns. His longest touchdown reception was a 38-yard catch and run with 13:16 remaining in the second quarter.
In the first quarter, the 49ers had 4.5 yards per play while the Cowboys had 0.9. For the entire half, the 49ers defense limited the Cowboys offense to 93 yards.
Cowboys quarterback Dak Prescott was sacked three times in the first half. San Francisco linebacker…