Tuesday, 6th—Our brigade went into Vicksburg this afternoon at 2 o’clock to be in the review, together with the entire army at this place. We were reviewed by Major General U. S. Grant. The report in camp is that General Grant has been ordered by the War Department to report at Louisville, Kentucky. All are sorry to see him leave. Just after dark, the Eleventh Iowa was ordered out on picket, it being expected that the rebel cavalry would make a dash into Vicksburg in the morning.