Hazrat Mohsin (AS) was martyred when they attacked the house of Fatima (AS) . This tragedy on Ahlul Bayt (AS) happened immediately after the Saqeefah conspiracy as Saqeefah people wanted to forcibly take allegiance from Ali (AS).
Confiscation of Fadak from its real owner Fatimah (AS) took place when they started their government.
'Wassalam.