Swordsmanship is a class skill set of a Warrior and a Hunter. Current skill is based on the ability to handle Sword Weapons.
Your hit accuracy increases when the skill grows.

Skill’s efficiency

This skill uses weapons with the most extensive damage and medium attack speed.

Ways of leveling your Swordsmanship

To use the skill your character must be equipped with a weapon belonging to Fencing Skill.
With the help of Tab button or other options attack and hit your target. The skill will grow with every hit.
for efficient training, use dexterity bonuses, like:
1. Magic cast, potion bottles, premium cast.
2. Bottle of transmutation potion.
3. Armor and clothes that increases dexterity.
4. High-speed weapons: swift, stygian, perfect.
Everything listed above should be used combined.

Here is a detailed video of how the skill is used: