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One cannot charge something one cannot see. One cannot get within 1" from the enemy without charging them. Does that mean if I have my units lining up behind a solid ruins' wall, the enemy cannot charge until they come full around and see me during their movement phase?

Yes. That's exactly what it means. Although only one model needs Line of Sight to initiate the charge, and Overwatch is done before movement so your opponent can pop out a sacrificial model to both start the charge and eat your overwatch fire before charging in with the rest of the models.