When you are faced with obstacles to a project and you just keep on going and working through, this is an example of a time when you soldier on with your project.
A man or a woman serving in the Army is an example of a soldier.
Origin of soldier
- Middle English soudier mercenary from Anglo-Norman soudeour, soldeier Old French soudoior, soudier both from Old French sol, soud sou from Late Latin solidum, soldum pay from solidus solidus solidus
From American Heritage Dictionary of the English Language, 5th Edition