sunni historian regarding the attack
They demanded confirmation of the oath, but Ali and al-Zubair stayed
away. Al-Zubair drew his sword (from the scabbard), saying, "I will
not put it back until the oath of allegiance is rendered to Ali." When
this news reached Abu Bakr and Umar, the latter said, "Hit him with a
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stone and seize the sword." It is stated that Umar rushed (to the door
of the House of Fatimah) and brought them forcibly while telling them
that they must give their oath of allegiance willingly or unwillingly
Sunni reference: History of al-Tabari, English version, v9, pp 188-189

now if thats true .... what say u regarding it?