So sorry, I tried to answer these using the internet phone at Waterloo station last night.. clearly it did not work...
Third Age? Yes
Living No?
Unique No?
Object Yes?
Proper name No?
Artificial structure - errr... no?
Built by a dwarf? No
A natural object? No
Used by a Man? Yes
Used by a man of Gondor? Or Rohan? Yes
Built/made by elves? No*
Used in battle? Yes
Used at the Battle of Pelennor Fields? Yes
Used at the battle of Helm's Deep? No
Is it a weapon? No
Built/made by orcs? No