Brave, spirited, noble-minded, or chivalrous: (Dictionary.com)
Exceptionally polite and attentive to women; courtly. (Dictionary.com)
In polite and kind way towards women, especially when in public. (Cambridge Dictionary)
In a brave or heroic manner. (Oxford Dictionaries)
The gallant behaviour of Sir Sydney [Sidney] Smith at the Siege of Acre.
Gallant behaviour of an English Sailor in offering a sword to an unarmed Spaniard to defend himself.
Malcolm Turnbull praises Tony Abbott’s ‘generous and gallant’ behaviour after spill.