Rail Code

Method

For this we add a number of "rails", and add the characters in sequence, such as for three rails (taken from Wikipedia):

'WE ARE DISCOVERED. FLEE AT ONCE', gives:

W . . . E . . . C . . . R . . . L . . . T . . . E
. E . R . D . S . O . E . E . F . E . A . O . C .
. . A . . . I . . . V . . . D . . . E . . . N . .

to give:

WECRL TEERD SOEEF EAOCA IVDEN

"WE ARE DISCOVERED. FLEE AT ONCE" with three rails should give WECRL TEERD SOEEF EAOCA IVDEN". Try!