Field Marshal Karl von Bülow is forced to give up command of the Second Army, after suffering a heart attack. He is awarded the Pour le Mérite on the same day.
He is replaced by Fritz von Below, who is moved from the Eastern Front.
How to cite this article: Rickard, J (28 December 2007), 4 April 1915, https://www.historyofwar.org/firstworldwar/daybyday/1915_04_04.html