Eugène de BEAUHARNAIS. Private letter, Rastenburg Headquarters, June 15, 1812, to Alexandre Berthier, Prince of Neuchâtel; 1 page, in-4. Before the start of the Russian Campaign. He has received his letter and is forwarding the orders concerning him to General Grouchy. The Emperor is expected to be in Eintersburg on June 17; he is having bread made and hopes “by the 21st or 22nd at the latest to have resupplied the divisions with four days’ worth of hardtack and four to eight days’ worth of flour.” The 4th Corps will have arrived at the designated positions by the 21st; “Drengfurth, Rastenburg, Sensburg & Rossel, the supply depot at Bischofsburg”…