Werner Hirsch wrote:
< I have been able to find a few references to this town on the Internet,
but none which indicate where this town is located or what its name might be
today. >
---

JewishGen Gazetteer
< http://www.jewishgen.org/Communities/LocTown.asp >

sounds like search for Petrisorul in Eastern Europe
Lunca Petrisorului, Romania (letter s has diacritic mark)
populated place
coordinates 4519/2652
71.6 miles NNE of Bucuresti

Falling Rain Global Gazetteer
< http://www.fallingrain.com/world/index.html >

alphabetical listing of places in Romania
Petrisoru (city) Judetul Buzau (Romania) 4533/2688
Lunca Petrisorului (city) Judetal Buzau (Romania) 4532/2687

Possible answer?

Bette Stoop Mas
USA

Dear Werner!
As I understand Your relative was a serviceman of Austrian or
German army who was killed in battle with Russian or Romanian troops.
Petrisorul now is Lunca Petrisorului - a city located in Province
Buzau, Romania - about 72 mi (or 115 km) North-East of Bucharest, the
country's capital town.

Regards,
Igor Holyboroda,
Lviv, Ukraine.

---
From: Werner Hirsch <wernerh@snet.net>
Date: Tue, 13 Oct 2015

I have a record that says that a relative of mine, Ludwig DAVIDSBURG,
was killed on 22 Dec. 1916 during WWI in a battle at Petrisorul,
Romania. The record is hand-written but the name of the town is
*very* clear. I have been able to find a few references to this town
on the Internet, but none which indicate where this town is located or
what its name might be today. I would greatly appreciate any help.

I have a record that says that a relative of mine, Ludwig DAVIDSBURG,
was killed on 22 Dec. 1916 during WWI in a battle at Petrisorul,
Romania. The record is hand-written but the name of the town is
*very* clear. I have been able to find a few references to this town
on the Internet, but none which indicate where this town is located or
what its name might be today. I would greatly appreciate any help.
Thanks.

Werner HIRSCH
New Haven, CT
wernerh@snet.net