Union Army of the Shenandoah was created in 1861.
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Union General Franz Siegel's advance into the Shenandoah Valley was cut short by Confederate General John C. Breckinridge. Breckinridge's army of 5,000 troops defeated Siegal's army at New Market, forcing a Union retreat.
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XXIV Corps - Union Army - was created in 1864.
XXII Corps - Union Army - was created in 1863.
VIII Corps - Union Army - was created in 1862.
VII Corps - Union Army - was created in 1862.
VI Corps - Union Army - was created in 1862.
XII Corps - Union Army - was created in 1862.
Union Army Balloon Corps was created in 1861.
XX Corps - Union Army - was created in 1863.
XVIII Corps - Union Army - was created in 1862.