A letter from Julius Caesar

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Last night I managed to 🤺 ambush a courier who was carrying an important ✉️ letter. It is signed by Gaius Julius Caesar himself.
I don’t understand it’s content, but I am pretty sure his army is planning to ⚔️ attack somewhere.

Here is the letter:

Ikxitkx yhk utmmex.
Hnk xgxfr bl ytk lnixkbhk bg gnfuxkl. Rxm B dghp ahp px vtg ybgteer wxyxtm max Ztnel.
Px pbee lnkkhngw maxbk vtfi tgw lmtkox maxf mh wxtma.
Lbgvx maxr tkx hg t abee uxmpxxg mph kboxkl, px atox mh unbew t lbxzx kbgz. Mabl kbgz lahnew bgvenwx uhma hnmxk utgdl.
Oxkvbgzxmhkbq pbee lhhg ux wxyxtmxw.
G. I. Caesar


Can you help me find out which 🗺️ location they want to attack?

Guess for free