Usage: 6 forms in 14 verses
Form Translated As     In Verse(s)
περικαθιείσ you shall besiege LXX.Deut.20.12
περικαθίσησ you should besiege LXX.Deut.20.19
περικάθισαν they besieged LXX.Josh.10.38
περιεκάθισεν besieged LXX.Judg.9.50 • LXX.1Kgs.15.27 • LXX.2Kgs.6.24
he besieged LXX.Josh.10.31 • LXX.Josh.10.34
περιεκάθισε besieged LXX.1Chr.20.1
περιεκάθισαν laid siege LXX.1Kgs.20.1
they besieged LXX.Josh.10.5 • LXX.Josh.10.36 • LXX.2Sam.11.1 • LXX.1Kgs.16.17

Liddell-Scott-Jones

περικαθίζω (perikathizō) to besiege G:V

περικαθίζω-ίζω,

cause to sit around or over, [Refs 5th c.BC+]

__2 π. στρατὸν τῇ πόλει invest a city, [Refs 1st c.AD+]
__II intransitive, sit round, τῇ πυρᾷ [Refs 2nd c.AD+]: but usually besiege, φρούριον Wilcken [Refs 2nd c.BC+]; τὸ τεῖχος variant in [Refs 1st c.BC+]; περὶ or ἐπὶ τὴν πόλιν, [LXX+1st c.AD+]
__III middle, invest, περικαθίζωεζόμενοι (aorist participle) τὸ τεῖχος [περικαθίζωισάμενος 1st c.AD: Memnon Historicus 45.1: \_intransitive\_">Refs 4th c.BC+] in passive form, περικαθίζωεσθέντες having sat down round about, [Refs 2nd c.AD+]present infinitive περικαθίζωέζεσθαι, = obsidere, [Refs]