Albert Barnes Commentary 1 Samuel 28:19

"Moreover Jehovah will deliver Israel also with thee into the hand of the Philistines; and to-morrow shalt thou and thy sons be with me: Jehovah will deliver the host of Israel also into the hand of the Philistines." — 1 Samuel 28:19 (ASV)

Rather, the phrase means God “will deliver Israel also.” Saul had not only brought ruin upon his own house but upon Israel as well. When Saul and Jonathan fell, the camp (not the “host”) would be plundered by the conquerors (1 Samuel 31:8; 2 Samuel 1:10).