Say I have 10 versions in bzr repository, and I want to remove the last 2 versions. I tried "bzr revert -r -3", but it just revert the files to the second last version, and the following "bar log" still shows all 10 versions in the repository.
The command to do that is uncommit:
bzr uncommit -r-3
The last two revisions will be removed from the branch.