The Barnyard Battle

"[4] The parrot in Steamboat Willie also spoke two full sentences, making him the actual first character in the series to speak this way.

The victory of the mice is celebrated in the tune of "Battle Cry of Freedom", known to have been popular among the forces of the United States during the same conflict.

In any case, both wars were still within living memory of the audiences at the time of release and so it is possible that the details mentioned were intended as recognizable references to both of them.

Because the cats wear helmets that resemble German pickelhaube, the cartoon was banned in Germany in 1930 on the grounds of being "offensive to national dignity".

The short was released on December 7, 2004, on Walt Disney Treasures: Mickey Mouse in Black and White, Volume Two: 1929-1935.

The short.
Mickey in the short.