"A sword brandished by the soldiers who once protected Hyrule Castle. Its durable blade is well tuned for slaying monsters."
The Soldier's Broadsword is a sword found in Breath of the Wild. It looks relatively new in appearance, sporting a small design making it easy to wield in one hand.
A Soldier's Broadsword can be found behind the waterfall in the River of the Dead, on the Great Plateau. A second Soldier's Broadsword can be found at the top of the ruins, behind the Ja Baij Shrine, right at the edge of the Great Plateau. With a base power of 14, it one of most powerful weapons Link can acquire while still on the Great Plateau.
Outside the Great Plateau, it is a common weapon of choice for Blue Bokoblins in the Dueling Peaks region, usually around Bokoblin Camps. They are also a common weapon of choice by the Black Moblins. While it is stronger than the Rusty Broadsword and Traveler's Sword, it quickly becomes outclassed by more power swords in the later game, including the Knight's Broadsword and Royal Broadsword.
Hyrule Compendium entry of the Soldier's Broadsword.