The Crimson Field won the battle of the dramas on Sunday night for BBC One, according to overnight data.
Oona Chaplin's period drama attracted 6.1 million (26.1%) viewers at 9pm for its debut episode. Earlier, Countryfile topped the ratings overall with 7.1m (32.6%) at 7pm.
Antiques Roadshow appealed to 5.7m (24.7%) at 8pm, while Match of the Day 2 scored 2.4m (17.5%) at 10.35pm.
On ITV, Endeavour rose by around 700,000 viewers from last week to 5.1m (21.9%) at 8pm (370k/1.8% on +1). Earlier, Catchphrase puzzled 3.7m (18.2%) at 6.45pm (293k/1.3%) and Off Their Rockers returned with 2.4m (17.5%) at 10.35pm (302k/1.3%).
BBC Two's Border Country gathered 989k (4.3%) at 8pm, followed by the finale of Louis Theroux's LA Stories with 1.6m (6.8%) at 9pm. Coverage from the F1 Grand Prix in Bahrain attracted 2.4m (15.3%) at 10pm.
Channel 4's Secret History documentary appealed to 1.4m (5.9%) at 8pm (265k/1.1%), followed by Liam Neeson film The Grey with 1.2m (6.2%) at 9pm (240k/1.9%).
On Channel 5, John Travolta movie Ladder 49 thrilled 598k (2.6%) at 8pm.
