assault

From Middle English assaut, from Old French assaut, itself from the past participle of assalir, from Late Latin assalīre — a combination of Latin ad ("at, towards") and salīre ("jump"). The English spelling gained its 'l' around 1530, when it was Latinized to match the Latin root more closely.

The word entered English through French as assaut, without the 'l' we now use. Around 1530, English spelling was adjusted to reflect the Latin original more directly, adding the 'l' and giving us the modern form.

It's closely related to assail, which comes from the same Old French verb assalir.