Node: ‪Grevens Bastion‬ (‪2117170667‬)

Node: Grevens Bastion (2117170667)

Add defensive works around Kastellet, update source and start date for existing defensive works

defensive_works	bastion
name	Grevens Bastion
place	locality
source	Trap, J.P. Statistisk-topographisk beskrivelse af kongeriget Danmark. 1872 https://archive.org/details/statistisktopogr01trap
start_date	1664
start_date:edtf	1662/1666
start_date:source	Skaarup, Dahl. Guide til Københavns Befæstning. 1996. https://www.kobenhavnshistorie.dk/index.php/e-boger/16-bog/gtkb/179-gtkb?showall=1

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