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.9.50LXX.1Kgs.15.27LXX.2Kgs.6.24
he besieged LXX.Josh.10.31LXX.Josh.10.34
περιεκάθισε besieged LXX.1Chr.20.1
περιεκάθισαν laid siege LXX.1Kgs.20.1
they besieged LXX.Josh.10.5LXX.Josh.10.36LXX.2Sam.11.1LXX.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]