Cant Complete SIEGE as Warrior playing SOLO.

[leaden flint]

You can throw melee weapons.
Check the config for the keybind since I don't remember it right now.

You can also switch to the secondary weapon, if you have one, since those are generally better for throwing.

[remote abyss]

In settings check your key bindings for 'Melee Throw / Recall' - With keyboard you hold down 'Block' to aim then hold 'Throw' to throw. This works the same with any melee weapon.

After you throw, you hold it again to bring the weapon back (Recall).