"Obviously, it was a must-win game for us - and the way we won it was really good," said Broad on Saturday. "The guys bowled fantastically well. Finny [Steven Finn] set the tone brilliantly for us... getting two key men out.
"I always think if you've got a batter and bowler who have a chance of winning the man-of-the-match award, you've played well. I think we had that today.
"We were delighted with [a target of] 148 [for six]. We just needed one big partnership, and Wrighty [Luke Wright] and 'Morgs' [Eoin Morgan] obviously delivered that."
A victory over Sri Lanka will almost book England's berth in the semi-finals.