This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Oh, what you really meant is that you were having problems deploying the war to a remote repository. Well, that's a different issue entirely and the cargo plugin will not help you there. (It is usually best to initially post the error that you are running into, doing so will get a solution quicker.)
Anyway, the problem appears to be that the remote repository you are using requires authentication to deploy artifacts. You need to add an entry in your settings.xml that looks like this: