The Japanese army used bicycle mounted infantry very successfully in their invasion and occupation of The British and Dutch East Indies.

On another note, my retired father used to ride his mountain bike on a short rural loop around the same time each day. Three or four times within a week or so a lowlife in a beat-up car harassed him on his rides by crossing head-on into his lane and running him into the ditch while spitting at him and yelling threats. My dad began riding with a 6" Model 629 mounted in a holster on the bike frame. He thankfully never saw his antagonist again, but he said he got some strange looks from passing motorists.