The Japanese Imperial Army had divisional Mixed Brigades, which were the detachment of a brigade from an IJA Infantry Division with various Divisional support units or units attached from its Corps or Army. This provided a combined arms force of infantry, artillery, cavalry and other support units.

Japanese Imperial Army Mixed Brigades

• 4th Mixed Brigade (Imperial Japanese Army)
  4th Mixed Brigade (Imperial Japanese Army)
  The 4th Mixed Brigade of the Imperial Japanese Army was a detachment from the 8th Division, in November 1931 to Heilongjiang province to reinforce the Invasion of Manchuria. It participated in the capture of Harbin in February 1932. It rejoined its parent unit when the 8th Division came to...
  
   - Manchuria 1931 - 1932
• 8th Mixed Brigade (Imperial Japanese Army) - Manchuria 1931 - 1932
• 14th Mixed Brigade (Imperial Japanese Army)
  14th Mixed Brigade (Imperial Japanese Army)
  In September 1932, the Japanese 14th Mixed Brigade was detached from the 7th Division in Japan and moved into Manchuria as part of the invasion of Manchuria. Later it rejoined its Division.- Sources :...
  
   - Manchuria 1931 - 1932
• 15th Mixed Brigade (Imperial Japanese Army)
  • Katayama Detachment
    Katayama Detachment
    The Katayama Detachment from the IJA 2nd Division fought small actions near Akiyama heights, or Heights 997 on 6th-10th of September 1939. 2nd Division was attached to Japanese Sixth Army in the Battle of Khalkhin Gol as reinforcement for a projected counterattack that was canceled when a cease...
    
     - Manchukuo 1939
• 24th Mixed Brigade (Imperial Japanese Army)
  24th Mixed Brigade (Imperial Japanese Army)
  The 24th Mixed Brigade was sent by the 12th Division from Japan to the Battle of Shanghai in 1932.*24th Mixed Brigade – ? , 3,000 troops** 2nd Battalion / 14th Infantry Regiment** 1st Battalion / 24th Infantry Regiment...
  
   - Shanghai 1932
• 33rd Mixed Brigade (Imperial Japanese Army)
  33rd Mixed Brigade (Imperial Japanese Army)
  The Japanese 33rd Mixed Brigade was a detachment of the Imperial Japanese Army 10th Division commanded by Major Gen. Nakamura in the Battle of Rehe in the battle along the Great Wall in 1933.- Sources :...
  
   - China 1933
• 39th Mixed Brigade (Imperial Japanese Army) - Manchuria 1931
• more to follow