Having trouble understanding how corkscrew works

I've recently been trying to use corkscrew along side ssh and have had trouble understanding what to put in the http proxy field. I imagine this is just a misunderstanding on my part, but I though I was supposed to enter the host I'm trying to ssh into in order to bypass a draconian firewall blocking all outgoing ssh packets. To better explain it what I did was added: "Host * ProxyCommand corkscrew my.proxy.com 443 %h %p" to my .ssh/config file and then tried using ssh to access my.proxy.com as so: "ssh -p 443 user@my.proxy.com" If someone could help me better understand how corkscrew actually works and what I should really be entering that would be wonderful.(If you haven't already noticed from the above examples I've been sending ssh through port 443.) -CL