From the Peninsula.
--The Petersburg Express, of the 12th inst., says:‘ A gentleman of Georgia, who left the Peninsula yesterday, reached Petersburg last evening. He states that our troops are in daily expectation of an engagement. The Yankees have occupied. Little Bethel in force. This is believed to be in accordance with Gen. Magruder's programmed, as he offered no resistance. Our impatient to engage the Virginia. It is thought that they will be gra many day older.
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