Using the subtree merge to join two repos, but maintain their history

gistfile1.txt

For more details:
http://www.kernel.org/pub/software/scm/git/docs/howto/using-merge-subtree.html

gitk --all output: 
http://www.flickr.com/photos/26681170@N03/2831381183/

gistfile2.txt

[Tekkub@KAKU: ~/Documents/github]$ mkdir testA

[Tekkub@KAKU: ~/Documents/github]$ cd testA

[Tekkub@KAKU: ~/Documents/github/testA]$ git init
Initialized empty Git repository in c:/Users/Tekkub/Documents/github/testA/.git/

[Tekkub@KAKU: ~/Documents/github/testA master]$ echo "This is repo A" > README_A

[Tekkub@KAKU: ~/Documents/github/testA master]$ git add README_A

[Tekkub@KAKU: ~/Documents/github/testA master]$ git commit -m "First commit to repo A"
Created initial commit e3b4372: First commit to repo A
 1 files changed, 1 insertions(+), 0 deletions(-)
 create mode 100644 README_A

[Tekkub@KAKU: ~/Documents/github/testA master]$ cd ..

[Tekkub@KAKU: ~/Documents/github]$ mkdir testB

[Tekkub@KAKU: ~/Documents/github]$ cd testB

[Tekkub@KAKU: ~/Documents/github/testB]$ git init
Initialized empty Git repository in c:/Users/Tekkub/Documents/github/testB/.git/

[Tekkub@KAKU: ~/Documents/github/testB master]$ echo "This is repo B" > README_B

[Tekkub@KAKU: ~/Documents/github/testB master]$ git add README_B

[Tekkub@KAKU: ~/Documents/github/testB master]$ git commit -m "First commit to repo B"
Created initial commit ab1b560: First commit to repo B
 1 files changed, 1 insertions(+), 0 deletions(-)
 create mode 100644 README_B

[Tekkub@KAKU: ~/Documents/github/testB master]$ cd ..

[Tekkub@KAKU: ~/Documents/github]$ mkdir testAB

[Tekkub@KAKU: ~/Documents/github]$ cd testAB

[Tekkub@KAKU: ~/Documents/github/testAB]$ git init
Initialized empty Git repository in c:/Users/Tekkub/Documents/github/testAB/.git/

[Tekkub@KAKU: ~/Documents/github/testAB master]$ echo "This is repo AB" > README_AB

[Tekkub@KAKU: ~/Documents/github/testAB master]$ git add README_AB

[Tekkub@KAKU: ~/Documents/github/testAB master]$ git commit -m "First commit to repo AB"
Created initial commit a8b2b79: First commit to repo AB
 1 files changed, 1 insertions(+), 0 deletions(-)
 create mode 100644 README_AB

[Tekkub@KAKU: ~/Documents/github/testAB master]$ git remote add -f repoA ../testA
Updating repoA
warning: no common commits
remote: Counting objects: 3, done.
remote: Total 3 (delta 0), reused 0 (delta 0)
Unpacking objects: 100% (3/3), done.
From ../testA
 * [new branch]      master     -> repoA/master

[Tekkub@KAKU: ~/Documents/github/testAB master]$ git merge -s ours --no-commit repoA/master
Automatic merge went well; stopped before committing as requested

[Tekkub@KAKU: ~/Documents/github/testAB master|MERGING]$ git read-tree --prefix=dirA/ -u repoA/master

[Tekkub@KAKU: ~/Documents/github/testAB master|MERGING]$ git commit -m "Merging repoA into dirA"
Created commit 0a29019: Merging repoA into dirA

[Tekkub@KAKU: ~/Documents/github/testAB master]$ git remote add -f repoB ../testB
Updating repoB
warning: no common commits
remote: Counting objects: 3, done.
remote: Total 3 (delta 0), reused 0 (delta 0)
Unpacking objects: 100% (3/3), done.
From ../testB
 * [new branch]      master     -> repoB/master

[Tekkub@KAKU: ~/Documents/github/testAB master]$ git merge -s ours --no-commit repoB/master
Automatic merge went well; stopped before committing as requested

[Tekkub@KAKU: ~/Documents/github/testAB master|MERGING]$ git read-tree --prefix=dirB/ -u repoB/master

[Tekkub@KAKU: ~/Documents/github/testAB master|MERGING]$ git commit -m "Merging repoB into dirB"
Created commit f787b47: Merging repoB into dirB

[Tekkub@KAKU: ~/Documents/github/testAB master]$ ls -R
.:
README_AB  dirA  dirB

./dirA:
README_A

./dirB:
README_B