When an organization has a short-term labor shortage and needs to hire some workers quickly but does not have time for a screening process, the best external recruitment source would be .

Recruiting

Explanation: Recruting is the process of shortlisting, selecting and appointing candidates for jobs within an organization.

The best external recruitment source would be temporary agencies.

Explanation:

A temporary agency works on finding and keeping employees. Companies tend to hire this external recruitment source in order to get temporary workers.

In this case, this organization's best option for a short-term labor shortage like this, would be to get help from a temporary agency because it is quicker, it's a temporary filling and there is no time for a screening process.

answer; the georgia militia men mortally wounded their commander;