This is a timeline of events between January of 1862 and December of 1913 in Cinco De Mayo.
5 May 1862 - The French army scores a victory over Mexican republicans at the Battle of Puebla, quickly dispersing the assembled native forces. The battle, a decisive victory, allowed for the rapid advance of French forces toward Mexico City.
4 June 1862 - Confederate troops defeat Union soldiers at Fort Pillow on the Mississippi River, helping keep control of Memphis, Tennessee.
16 June 1862 - Mexico City falls after a two-week siege and the government of Benito Juárez flees to northern Mexico as a government in exile. Charles de Lorencez, the French commander in Mexico, is made military governor and Provisional Head of State of Mexico.
9 August 1862 - Confederate General Stonewall Jackson defeats Union General John Pope at Cedar Mountain, the first of several decisive victories in the Second Manassas Campaign.
1 September 1862 - The Union Army of Virginia under John Pope is devastated at Chantilly (Ox Hill), effectively destroying the Army's main fighting force and leaving much of the area around Washington, D.C. defenseless. It is regarded as the turning point of the War of Southern Independence.
15 September 1862 - Robert E. Lee defeats George B. McClellan's army at Antietam (Sharpsburg), though it is not nearly as bloody or inconclusive as in OTL. The battle marks the beginning of the Chambersburg campaign.
22 September 1862 - In a bloody battle at Williamsport (Conococheague), McClellan manages to stall Lee's advancing forces and pull back to recapture Hagerstown, which he abandons in early October after JEB Stuart crosses the Potomac into Maryland.
29 September 1862 - Mexican conservatives loyal to Lorencez devastate a Republican army at Zacatecas, forcing Juarez's forces farther north in northern Mexico.
5 October 1862 - In the war's most crucial engagement, Lee's Army of Northern Virginia defeats McClellan again at Chambersburg, Pennsylvania, and burns a crucial railroad bridge at Scotland. Coming less than a month after the embarrassment at Chantilly, it is a major blow to morale in the North, especially after news of cavalry raiding parties setting farms and towns in southern Pennsylvania ablaze.
10 October 1862 - Lee retreats from Pennsylvania, burning Hagerstown on the way back across the Potomac in a move that scars the area and turns many Marylanders against the Confederacy.
3 November 1862 - The Republicans lose 28 seats in the House of Representatives, giving them a perfect tie for seats with the Democrats were it not for their Alliance with the 24 Unionist Representatives. Democrats sweep the state legislatures, particularly in the Midwest, and the Senate moves to narrow control by an alliance of Democrats and Unionists, who officially oppose secession but seek a speedier end to the war through diplomacy and accommodation with the South.
23 November 1862 - Encouraged by battlefield successes in the eastern theater and Republican losses in the midterms, French Emperor Napoleon III announces in his "Proclamation of Recognition" that he views the Confederate States of America as a "sovereign and independent state." News of this declaration quickly lead to recognition by Brazil and the new Mexican government led by Lorencez.