1)
What is "Shav'as ha'Ir"?
1.
Malbim: They screamed to be saved.
2)
Why did Hashem strike the Pelishtim while they had the Aron?
1.
Kli Yakar (Lani'ado) citing Mahari: (a) They thought that their victory was due their strength, and the Aron is a mere Kli. Hashem showed them that His hand struck Yisrael, and also Pelishtim. (b) It was so they would send it back soon. If not, they would have kept it a long time.
