Stuck nail

In the corral I had an old unused wooden gate that I plan to take apart some day as it is too old and broken to bother to fix.  Today I noticed a few nails sticking out the gate and from a few fence posts.  I decided to remove the nails before an animal rubbed against them and got cut.

The wood is old and dry and that made removing the nails difficult.  One nail in a post was extremely hard to remove.  I took a pair of vice grip pliers and was able to turn the nail so I knew it wasn't "welded" to the wood.

I even used a crowbar and hammer and had trouble pulling the nail out.  Finally after much work and leverage I got the nail out.   Oh... the nails had 'ridges' and that was what made it difficult to remove.