Typically, the left wing focuses on stalling the opposing right wing's attacks and buying time, so it deploys many discarded units such as conscripts.
The center also usually focuses on holding its ground. The main attack is on the right wing. Naturally, the position that can make the greatest contribution is on the right wing.
Left-handed line infantry are never placed on the right wing because of this background.
They are always on the left wing.
Even if they are left-handed, they are made to fight with a spear and sword in their right hand. This ensures that they can protect themselves and their comrades with shields and maintain the ranks.
However, if they are going to place a left-handed soldier on the right wing, there would be no reason not to step forward.
"Hmm… it's not enough."