What was the second event that started the snowball towards the Civil War

On January 29, 1863, a snow ball fight happened which leads to civil war.

Explanation:

A friendly snow ball fight was occur between hundred men of Texas and Arkansas camp. Soon this friendly fight is converted into real fight and leads to civil war when the 9000 soldiers of Army of Northern Virginia were also take part in the fight. Another snow ball fight was also happened in 1864 in which five or six thousand men were engaged when brigade of Breckenridge's Division attack on the Strahl's Brigade.