Though BBC One was expected to beat its commercial rival, its average of 10.03m (41%) versus ITV1's 1.7m (6.3%) represents a record gap.
Spain's 4-0 thumping of Italy, who were reduced to ten men for the last quarter of the match, peaked with a colossal 14.5m at 9pm when combing both channels' audiences.
Over on BBC Two, Mock the Week's delayed episode - rescheduled from last Thursday - took 1.52m (7.7%) at 10.10pm.
Feature-length drama The Boys are Back, starring Clive Owen, enthralled 1.22m (4.6%) between 8pm and 9.45pm, while Come Dine with Me served up 1.29m (4.9%) at 8pm (+1: 167k/0.6%) and was Channel 4's best-rated programme of the night.
Once Upon a Time rallied from last week's all-time low to 867k (3.3%) at the same time as Come Dine on Channel 5, adding 120k (0.4%) on timeshift. Then Big Brother entertained 1.09m (4.1%) and 185k (1%) on +1.
Classic drama channel ITV3 got the better of Five with a two-hour repeat of Lewis, which interested 1.33m (5%) between 8pm and 10pm.
Overall, BBC One led the way in primetime with an impressive 38.8%, obliterating ITV1 which had a miniscule 6.5% (+1: 0.3%). BBC Two earned third place with 5.9%, ahead of Channel 4's 4.5% (+1: 0.7%), ITV3's 4.3%, and Channel 5's 3.6% (+1: 0.5%).
BARB ratings data supplied by Attentional