I didn't see this during the season. Apparently you can steal 1st base

[Crawfords Corner]

Here is how baseball reference described it. http://www.baseball-reference.com/boxes/MIL/MIL201304190.shtml

http://wapc.mlb.com/play/?content_id=26416825&topic_id=&c_id=mlb&tcid=vpp_copy_26416825&v=3