Date: 26 Tevet 5581
From: Rabbi Moshe Sofer
To: Rabbi Feish
The responsum addresses a ruling by a local rabbi permitting children to carry in a public domain without an eruv on Shabbat, based on the Taz's interpretation of the Mordechai, and questions its validity against the Shulchan Aruch.
Source: Shu"t Chasam Sofer Collected §13