Assaulter

a sudden, violent attack; onslaught:
an -ssault on tradition.
law. an unlawful physical attack upon another; an attempt or offer to do violence to another, with or without battery, as by holding a stone or club in a threatening manner.
military. the stage of close combat in an attack.
1 .
to make an -ssault upon; attack; -ssail.
historical examples

again concealing the weapon within his doublet, a sudden realisation of the necessity for speed overcame the -ssaulter.
the strong arm robert barr

weaponless, the -ssaulter had used his hands, and now with a knee upon mexia’s breast he strove to throttle him.
sir mortimer mary johnston

i have friends who will find means to succour and protect you, be who will your -ssaulter!’
the wanderer (volume 4 of 5) f-nny burney

noun
a violent attack, either physical or verbal
(law) an intentional or reckless act that causes another person to expect to be subjected to immediate and unlawful violence compare battery (sense 4), -ssault and battery

the culmination of a military attack, in which fighting takes place at close quarters
(as modifier): -ssault troops

rape or attempted rape
verb (transitive)
to make an -ssault upon
to rape or attempt to rape
n.

late 14c., earlier asaut (c.1200), from old french asaut, -ssaut “an attack, an -ssault, attacking forces” (12c.), from vulgar latin -adsaltus “attack, -ssault,” from ad “to” (see ad-) + latin saltus “a leap,” from salire “to leap, spring” (see -ssail). in law by 1580s; historically, -ssault includes menacing words or actions; battery is an actual blow.
v.

early 15c., from middle french asauter, -ssauter, from vulgar latin –ssaltare (see -ssault (n.)). related: -ssaulted; -ssaulting.