<a href="https://en.wikipedia.org/wiki/Operation_OAU" id="mw4g" rel="mw:WikiLink" title="Operation OAU">Operation OAU</a> begins during the <a href="https://en.wikipedia.org/wiki/Nigerian_Civil_War" id="mw4w" rel="mw:WikiLink" title="Nigerian Civil War">Nigerian Civil War</a>.