The Bruins showed plenty of gumption, but they could not outhustle their mistakes on Monday at the Garden.

They had their chances to complete a comeback from a three-goal deficit – incurred by a series of their own miscues – but the B’s fell to the Tampa Bay Lightning, 4-3, suffering their first loss of the young season.

Entering the third period down a goal, the B’s pushed hard in the third period but could not get the equalizer.

The Lightning came into the game with some urgency after losing their first two of the season and, in the early going, the B’s were only too helpful let them get in the win column.

“They came ready to play. They lost two in a row,” said coach Marco Sturm, whose team is now 3-1. “We know from their starting six, we knew they wanted to get to work right away a

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