Ikkaku Madarame vs. Tetsuzaemon Iba

Ikkaku Madarame vs. Tetsuzaemon Iba was one of the battles that occurred during the Ryoka Invasion. As the 11th Division captain and its members assisted the Ryoka and were searching for Ichigo Kurosaki, the captains of the 7th and 9th Divisions, Kaname Tōsen and Sajin Komamura, as well as their respective lieutenants Shūhei Hisagi and Tetsuzaemon Iba confronted them. While Kenpachi calls for the rest of the group to go on ahead so he could have a 4-on-1 match, Ikkaku Madarame and Yumichika Ayasegawa intercede. Both wish to fight against the lieutenants as they figure that they are not to good enough to fight their captain. Ikkaku is called out to fight by Tetsuzaemon Iba, who details that it has been some time since they last saw each other and how sharper his insulting loud mouth has gotten. Ikkaku retorts that he is one to talk, making note that Iba left the 11th Division because he couldn't become lieutenant, the two leave to fight elsewhere.

Battle
The battle between Ikkaku and Iba is not shown. It is presumed that they did battle as they are both later seen resting.

Aftermath
Both combatants are seen resting and drinking with each other. Ikkaku makes a comment about a lighting strike and Iba scolds him for being ignorant as it was no lighting strike but Kidō and that it wouldn't have reached them as it was a targeted attack. Iba then states that Ikkaku has not improved one bit as he still knows nothing of Kidō. Ikkaku tells Iba he was never interested in Kidō anyway and states that unlike him, his mother didn't make him a do-it-all type of guy. Iba explains that he wasn't always so good, but instead of focusing on only one thing, being well rounded means a better chance at a promotion to lieutenant. They then fight again (with the loser having to go acquire more liquor) after engaging in a small argument about Iba always drinking too much of Ikkaku's booze.