To be at loggerheads

to quarrel; to be at strife.
- L' Estrange.

See also: Loggerhead

References in classic literature ?
A fine thing it would be if the people of the clock town were to be at loggerheads every moment with everyone who called them by that name, -or the Cazoleros, Berengeneros, Ballenatos, Jaboneros, or the bearers of all the other names and titles that are always in the mouth of the boys and common people