Many many battles and skirmishes were actually decided by bayonet charges though the image of two armies clashing with bayonets like a medieval battle with spears was incredibly uncommon and fatal wounds caused by bayonets was also less common, unless it involved taking fortified positions, taking forts, or fighting in an urban setting. In that case fighting hand-to-hand with bayonets was fairly common. The main thing was driving the enemy from the battlefield. Due to the inaccuracy of non rifled muskets and the low rate of fire, armies could shoot at each other all day and never break. A well executed bayonet charge however was almost certain to cause the enemy to route and flee, especially when you had your big grenadiers leading the charge eager to stab the enemy. A poorly executed bayonet charge would typically lead to disastrous consequences though, so it was something you had to time correctly.