I need help identifing these objects civil war

[kimonswanson643]

I found all these objects at a civil war site the big iron thing looks like a real thick spoon shape but with out a scooping part whit some thing on it. The round thing looks like a small shot gun shell. The button looks like a regular butten what kind and how old anyone know. The butten is green patina. The triangle thing has 4 holes and looks like part of something any help would be appreciated.