O's triumph over Shakers
Birmingham boss Lee Clark hit out as his team after their 3-2 defeat to Wolves.
The Blues fought back from 3-0 down but the damage was done in what Clark labelled a "woeful" first half when the visitors scored all three of their goals.
Birmingham had looked impressive in beating Crystal Palace on Good Friday and Clark cut a frustrated figure afterwards.
"Quite simply, without the ball in the first half we were rubbish, with it we were decent," Clark said.
"With it in the second half we were decent again and without it we were good. But in the first half we were woeful.
"Three or four players weren't at it and you can't have that. With the ball, you can have three or four players maybe not having a great day but without it, you have to have 11 putting a shift in.
"I think we got a little bit caught up and excited about what happened on Friday, thinking we could just turn up and play our football, forgetting you've got to win the battles.
"It's a very frustrating day for us when you think if we'd got three points we could have gone eighth in the table."
Jimmy Smith opened the scoring in the ninth minute when he slammed the ball home from 12 yards after Mathieu Baudry had flicked on a corner by Dean Cox.
That goal came against the run of play with Bury squandering three chances in the opening three minutes when Tom Soares twice failed from eight yards and Nicky Ajose then fired wide from 10 yards.
Bury's woes increased when David Mooney doubled the lead in the 34th minute after some woeful defending. Lloyd James played the ball into the box and Smith then swept it onto the unmarked Mooney to notch his 13th goal of the season.
The visitors continued to throw away chances after the interval with Steven Schumacher and Andy Bishop again failing to find the target when well-placed.
And it was the home side who came closest to adding to the scoreline when Mooney and Charlie MacDonald saw efforts scrambled off the line.