Mercurial moving commits in another branch

Imagine the following scenario:

D
|
C
| "I want to move C and D here"
B/
|
A

Steps:

1. hg update B
2. hg branch "mybranch"
3. hg commit --message "Create my branch"
4. hg update mybranch
5. hg graft -r C
6. hg graft -r D

7. hg strip -r C (this should be the revision C had originally)

   The strip command is provided by an extension that you need to enable. You can follow a guide on how to enable it on the Mercurial Wiki.

8. hg update default