Umification was painful and at first avoided for it meant a radical
reorganisation in which habits of work would have to be changed.
During the summer of 1943 Blair-Conynghame was called to Africa
and Lewis (then Maj. OIC of the Fusion Room, now Lt. Col.) took his
place. Gadd continued to direct the "source side" of T.A. And,
Lithgow remained at the head of both until around October when he
transferred to Hempstead Training Centre. Then, Col. Crankshaw took
his place. The lingering organisational division between Gadd
(traffic readers, Source Bureau, Liaison Department and M.I.8 Watch)
and Lewis (log reading, D/F and fusion) was finally broken down.
With the moral support of Welchman, "Sixta" was formed and in
November, 1943 Lewis assumed command. The nominal connection with
Hut 6 was severed although through the efforts of Maj. Webster,
Capt. Rushworth and Fusion Room sector officers, operational intimacy
continued to grow. traffic readers moved into the Fusion Room and
the basic fusion process of reading traffic in its signals context
was begun. The Source Bureau, Liaison Department and M.I.8 Watchg,
in short, Hut 3 began to rely upon and in fact applaud the efforts
of log reading and fusion. Hut 6 (Cryptography). Hut 3 (Intelligence)
and Sixta (T.A.) became operationally unified. In February, 1944
Lewis went to Washington and Gadd became OIC Sixta.
The growth of T.A. under Blair-Conynghame, Lewis and Gadd has
involved a series of changes both superficial and radical which have
all tended in the direction of the complete operastional integration
of T.A. with Cryptography and Intelligence. By degrees, T.A. know-