| Show Greece Guerillas Retreat to North ATHENS A April P r 11 19 UP Twenty thousand Greek guerillas harassed by the Greek army of of- I f-I and divided by a conflict w within i h I 1 n the Communist party were retreating northward Saturday Saturday Saturday Satur Satur- day to form a front in the mountains mountains moun moun- talus near the frontier with Albania Albania Albania Al Al- bania Yugoslavia and Bulgaria The guerillas' guerillas aim appeared to tobe tobe tobe be creation of a front leaving them thema a line of retreat into the neighborIng neighboring neighboring neigh neigh- boring countries Neutral military observers said the government offensive in northern north north- em ern Thessaly against 2000 encircled encircled encircled cled guerillas had failed Communist sources s sou 0 U r c e s said the greatest danger to the guerillas was not the army but a serious disagreement within the party as asto asto asto i to whether it should support moves to give parts of northern Greece to Yugoslavia and Bulgaria |