They attacked from three sides

During the war of 1948 the Israeli forces attacked Palestinian villages from three sides ...
allowing an escape route for those who did not resist..... most left allowing the
invaders to take the town ... those who resisted were massacred ... this is according
to Israeli historian Ilan Pappe in "The Ethnic Cleansing of Palestine".

from the January 11 Los Angeles Times :

Carolyn Cole / Los Angeles Times
Smoke rises from the edges of Gaza City on Sunday afternoon.

Gaza City under attack; Israeli missiles hit village

Conflict in Gaza
Carolyn Cole / Los Angeles Times
Smoke rises from the edges of Gaza City on Sunday afternoon.
Troops and tanks come at the capital from three sides. Also, scores of Palestinians are injured and their homes burned in a missile barrage in southern Gaza.
By Richard Boudreaux and Rushdi abu Alouf
12:54 PM PST, January 11, 2009
Reporting from Jerusalem and Khan Yunis, Gaza Strip -- Israeli troops and tanks thrust into the Gaza Strip's densely populated capital from three directions today, drawing Hamas fighters into fierce combat in an offensive expanded by a fresh deployment of army reservists.

The assault on Gaza City coincided with a predawn missile barrage that set 20 homes ablaze in a southern Gaza village. Scores of residents suffered burns and gas inhalation, witnesses said. Doctors who treated the victims said they suspected Israel had fired white phosphorus shells, which can be used to illuminate the nighttime battlefield or to lay down a smoke screen.

copyright Los Angeles Times, 2009
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Comment:

In 1948 many of those fleeing wound up in Egyptian controlled Gaza.
In this case where can those fleeing go?