[Ichthypresbyter]

While General Dufour (who had commanded the Federal forces in the Sonderbund War) was one of the five-man founding committee, the event that precipitated the founding of the Red Cross was the visit of Henri Dunant to the battlefield at Solferino immediately after the battle.

The Battle of Solferino (part of the Second War of Italian Independence, in which an alliance of France and Sardinia defeated Austria) took place 12 years after the Sonderbund War, in 1859. As far as I know Dunant had taken no part in the Sonderbund War- he was a student in Geneva at the time- and neither had anyone else on the committee apart from Dufour. In fact, two of them had been outside Switzerland at the time.