The phrase "several medals" means that there is more than one medal. It indicates that someone has been awarded or received multiple medals for their achievements. Full definition
She has run the mile in meets in junior high and high school, constantly improving her times and winning several medals. (kidshealth.org)
He retired as a warrant officer after having received several medals and awards. (gowlingwlg.com)
From 1988 to 1991, he served as a captain in the United States Army and was awarded several medals for his services as an AH - 64 Apache helicopter pilot in the Gulf War. (cnbc.com)