ction of the two rivers, and would employ the
subjugated Britons of the locality in constructing, it may be, at first
only a rude fort, protected on two sides by the streams and in the rear
by a "vallum," or embankment, and that on the site thus secured and
already a native stronghold, they would, at a later period, erect the
"castrum," of which massive fragments still remain, testifying to its
great strength.

These remains, indeed, in almost their whole course can be traced through
present-day gardens and back premises, shewing the four sides of an
irregular parallelogram. Their dimensions, roughly speaking, are on the
north and south sides about 600-ft., by about 350-ft. at the eastern, and
300-ft. at the western end, their thickness being about 16-ft. The
material employed was the Spilsby sandstone, obtainable within five
miles, cemented by course grouting poured into the interstices between
the massive blocks. These walls inclose a portion of the High Street as
far eastward as the site of the present Corn Exchange, westward they
include the present manor house and form the boundary of the churchyard
in that direction. On the north they run at the back of the houses on
that side of the Market Place, and on the south they extend from St.
Mary's Square, past the Grammar School, and through sundry yards,
parallel with the branch of the canal, which is the old Waring river.
The masonry of these walls, as now seen, is very rude. It is supposed
that, originally as built by the Romans, they had an external coating of
neat structure, but this has entirely disappeared, it is still, however,
to be seen in the wells, which are next to be described.

In a cellar, south of the High Street, at a baker's shop, and close to
the eastern wall of the castle, is a Roman well; there is another close
to the north-east angle of the castle walls, in what is called Dog-kennel
Yard, and a third just within the western wall, near the present National
Schools. Thus, although the two rivers were without the castle walls,
the Roman garrison was well supplied with water.

The Roman roads branching from the town were (1st) the "Ramper," {6a} as
it is still called, running north-west, and connecting it with the Roman
station Lindum; from this, at Baumber, {6b} distant about 4 miles, a
branch running northwards led to the Roman Castrum, now Caistor; (2nd)
north-eastwards _via_ West Ashby, being the highway to Louth, the Roman
Luda; (3rd) eas