According to the Arnold Hague Convoy Database at:
http://www.convoyweb.org.uk/hague/index.html
Convoy CW 9 contained 26 freighters with no escorts. It departed Southend on 7 August 1940.
The
Empire Crusader (1042 tons) was bombed and sunk. It was the only vessel of this convoy to be sunk.
I can’t access the Miramar Ship index site to get more particulars.
I hope that this sheds some light on all this.
DGS