This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Well, technically, Maven isn't based on developer "build scripts". It's based on the POM, which is more about defining what's located where and what the dependencies are.
To build a Maven WAR project, define the project as a WAR in your pom.xml file. When building inside Eclipse, right-click on the pom.xml in the navigator, and select the "Run As" menu. It should display a number of Maven goals. Usually "package" will do what you want.
An IDE is no substitute for an Intelligent Developer.