User blog comment:Some Argonian Named Kesch/Stormcloak Rebellion: Is Anyone Really Right?/@comment-24165787-20131113212045/@comment-13446185-20131115035211

Second it took Tiber Septim bringing the numidium to the Isles to make the Altmer surrender, as he knew he could never beat them there(the Isles).

Never says this in lore anywhere. Tiber Septim brought the Numidium everywhere he could as it made conquest extremely easy and quick "The Surrender of Alinor happened in one hour,".

The only place Tiber was ever reluctant to invade was Blackmarsh.