There are sickles and then there are sickles though, it depends upon the angle of the blade to the handle. There are those that I would call more of a "hand scythe" than a true sickle in the way that you swing them, and they will tangle with fences. At the moment the grass is so wet you just can't cut it with anything, all you do is beat it down. Dunno 'bout strimmers and mowers but I cleared the back path to my allotment from the waist high grass, cow parsley and gawd knows what by driving my 4WD over it.
I once nearly cut my thumb off sharpening a sickle of the traditional kind. Ouch!
You do not want to hear about my brothers "grim reaper" scythe though. He has one hanging from his ceiling, like a sword of Damocles, and the comfy "guest" chair is directly beneath it.