In Estonia nobody was waiting for a military attack from South, the Staff however did not lose interest for Latvia and its army.
In case of war with Soviet Union it was important to know the strength of the ally for knowing how fast it would be possible for the Red Army to crash Latvian forces and reach the Southern border of Estonia.
Espionage in Southern direction was improbable thus the first little error would have caused catastrophic diplomatic consequences.
The main sources of information were Latvian publications, reports from attaches in Riga and officers studying in the units of the Latvian Army and materials handed over by Information Department.
Despite the lack of personnel and finances, the military intelligence services of Estonia and Latvia had accurate picture about their neighbouring country and its Army.