Third times the Charm
In late April the war in the eastern theater would heat up again. On April 22 General Meade began his first invasion of Virginia as commander of the Army of the Potomac. Though the war Britain was lessening the amount of troops and supplies the forces confronting the Confederacy acquired, Meade's army numbered nearly 95,000. General Lee and the Army of Northern Virginia, fielding only 71,000 troops, have been encamped at Culpeper and quickly marched north to confront Meade. Nine days later the armies would meet on the hollowed grounds of Manassas for a third time.
The Third Battle of Manassas drenched the fields in blood for over twenty hours as Union forces tried to force the Confederates to retreat. The third time would finally be the charm for the Americans and on May 2 Lee was forced to withdraw after suffering 17,000 casualties. This was the first ray of hope for the Union in months and despite suffering 13,000 casualties of their own, the Army of the Potomac continued south three days later.
The next two weeks northern Virginia saw several more engagements between the two main armies in North America. The Battle of Culpeper would be the next major battle of the campaign on May 16. The Army of Northern Virginia had only 35,000 troops for this battle as General Jackson and his corps was sent into the Shenandoah Valley to defeat a Union force under Major General John C. Fremont. While the Shenandoah Valley Campaign would prove another success for Jackson the Battle of Culpeper would not for Lee who the next day withdrew across the Rappanahock. During the Battle of Culpeper however the Army of the Potomac had suffered nearly 20,000 casualties and General Meade would halt the offensive to rest.
Return Advance
Austria's defeat at the Battle of Worth had stopped major military actions in France for nearly a month. However on April 1 a Russian Army of 120,000 under General Ivan Krasnov joined with the 100,000 mostly Austrian forces under General Ludwig von Benedek at Strasbourg and moved to capture Metz. Marshal Patrice de MacMahon commanded the newly titled French Army of the Rhine now numbering nearly 210,000 was held up at Metz and moved to challenge the Austro-Russian Army on April 9 at Gravelotte.
The massive Battle of Gravelotte saw the blood of over 71,000 spilled for their respective countries. After 18 hours of battle the French were driven off the field and withdrew towards Metz. Ten days later the Austro-Russian Army converged on Metz and laying siege to that city and the French Army on April 20. As the Siege of Metz continued a new French Army was beginning to be created to relieve Metz at Sedan. On April 30 the British Expeditionary force numbering nearly 80,000 troops under General William John Codrington arrived at Sedan and were joined with 45,000 French troops to assault the Austro-Russian Army and relieve Metz. Four days later the Battle of Metz commenced as the allies tried to break the siege. After nearly two days of intense battle Russian and Austrian forces, suffering over 75,000 casualties on their own, were broken and withdrew to Strasbourg with the British and soon French armies in pursuit.
First Actions
Hostilities between Italy and Austria would begin on April 15. The Italian forces were divided into two armies: the first, under La Marmora himself, was deployed in Lombardy, west of the Mincio River, aiming toward the powerful Quadrilatero fortress of the Austrians; the second, under Enrico Cialdini, in Romagna, south of the Po River, aiming toward Mantua and Rovigo. La Marmora moved first through Mantua and Peschiera del Garda, but was defeated at the Battle of Custoza on April 19 and retreated disorderly back across the Mincio river. Cialdini, on the other hand, did not act offensively for the first part of the war, conducting only several shows of force and failed to besiege the Austrian fortress of Borgoforte, south of the Po. Following the defeat at Custoza, the Italians reorganized in preparation for a presumed Austrian counter-offensive. The Austrians took this opportunity to raid Valtellina and Val Camonica at the Battle of Vezza d'Oglio.
Thanks to their allies decisive victory at Metz Italy gained a break. The Austrians were compelled to redeploy one of their three army corps from Italy. The remaining Austrian forces in the theater concentrated their defenses around Venice, Trentino, and Isonzo.