Written: Written not later than April 29 (May 12), 1917
Published: First published in 1918 in the hook Seventh (April) All-Russia Conference of the R.S.D.L.P. (Bolsheviks). Petrograd City Conference of the R.S.D.L.P. (Bolsheviks). April 1917. Minutes, p. 364, Note 175. Printed from the original.
Source: Lenin Collected Works, Progress Publishers, , Moscow, Volume 43, page 631b.
Translated: Martin Parker and Bernard Isaacs
Transcription\Markup: R. Cymbala
Public Domain: Lenin Internet Archive (2005). You may freely copy, distribute, display and perform this work; as well as make derivative and commercial works. Please credit “Marxists Internet Archive” as your source.
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I received your invitation and thank you for it with all my heart. I regret that I am absolutely unable to attend your congress today in view of my commitments to the All-Russia conference of our Party.
The conference proceedings have dragged out, there will probably be an all-night sitting, and I cannot get away for a minute. Please forgive me.
With comradely greetings,
 The frontline congress of delegates from the army in the field was held in Petrograd from April 24 to May 4 (May 7–17), 1917.